MESON Chess Problem Database

Problem Display
PID: 231642 (1B2NR1b/pb2N2r/r3k3/nB4P1/2p5/Q7/K3p3/8 w - - 0 1)

Grunfeld, Max

Magyar Sakkvilag, 1927

1B2NR1b/pb2N2r/r3k3/nB4P1/2p5/Q7/K3p3/8

#2

8 + 9

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd6
      • 2.Qxd6#
    • 1...Rg7
      • 2.Rf6#
    • 1...Bc6
      • 2.Qd6#
    • 1...Bf6
      • 2.Rxf6#
  • Tries
    • 1.Sg7+?
      • 1...Rxg7
        • 2.Rf6#
      • 1...Bxg7!
    • 1.Bxa6?
      • threat
        • 2.Qd6#
      • 1...Kd7
        • 2.Qd6#
      • 1...Be5!
    • 1.Qe3+?
      • 1...Be5
        • 2.Qxe5#
      • 1...Be4!
  • Keys
    • 1.Sf6!
      • threat
        • 2.Bd7#
      • 1...Rxe7
        • 2.Qh3#
      • 1...Bxf6
        • 2.Rxf6#
      • 1...Rd6
        • 2.Qxd6#
      • 1...Rc6
        • 2.Qe3#
      • 1...Bc6
        • 2.Qd6#
      • 1...Bc8
        • 2.Qe3#
      • 1...Sc6
        • 2.Bxc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(d);N_GUARD::QAR1(B),XR(d)
    • R(h);S_CUTB(i)::R1(H)
    • B(g);S_CUTR(d)::QAR1(B)
    • B(i);N_GUARD::R1(H),XB(i)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • R(h);XS(G)::R1(H)
      • Refutation
        • B(i);XS(G)
    • Try
      • B(C);XR(d)
      • Threat
        • QAR1(B)
      • Vars
        • K(e);S_FLIGHT::QAR1(B)
      • Refutation
        • B(i);
    • Try
      • Q(B);CHECK
      • Vars
        • B(i);N_GUARD,P_SPINB(i)::QAR1(B),XB(i)
      • Refutation
        • B(g);P_SPINB(g)
  • Actual
    • S(G);
    • Threat
      • B(C)
    • Vars
      • R(h);N_GUARD,SBLOCK,XS(E)::QAB(B)
      • B(i);OGATE,XS(G)::R1(H),XB(i)
      • R(d);N_GUARD::QAR1(B),XR(d)
      • R(d);S_CUTB(g)::QAR(B)
      • B(g);S_CUTR(d)::QAR1(B)
      • B(g);N_GUARD::QAR(B)
      • S(c);N_GUARD,P_PINQ(B),S_CUTB(g)::B(C),XP(b)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).